Disable fail-fast for GitHub CI

With the large range of supported versions it’s beneficial to see which
ones exactly do fail and why to avoid whack-a-mole debugging scenarios.

Author: ur5us

.github/workflows/main.yml

@@ -10,6 +10,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         ruby_version: ['2.5', '2.6', '2.7', '3.0', '3.1', '3.2']
         rails_version: ['5.0', '5.1', '5.2', '6.0', '6.1', '7.0']